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6 changes: 3 additions & 3 deletions wiki/pages/introductions-to-twelf.elf
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This paper provides a more formal introduction to the modern way of thinking
about LF and Twelf than this site does.
- Alberto Momigliano's [A Practical Approach to Co-induction in
Twelf](http://www.cs.nott.ac.uk/types06/slides/am.pdf) describes a technique
Twelf](https://momigliano.di.unimi.it/talks/pact.pdf) describes a technique
for encoding Twelf-unfriendly co-inductive proofs as Twelf-friendly induction
proofs (slides from a talk at TYPES 2006).
- John Altidor's
[tutorial](http://jgaltidor.github.io/typetheory_paper.pdf) and
[slides](http://jgaltidor.github.io/twelf_slides.pdf) are accessible to folks
[tutorial](https://jgaltidor.github.io/typetheory_paper/typetheory_paper.pdf) and
[slides](https://jgaltidor.github.io/twelf_slides/twelf_slides.pdf) are accessible to folks
without a strong background in programming language foundations.

### Experience reports and commentary
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